Photodisintegration cross section measurements on {sup 186}W, {sup 187}Re, and {sup 188}Os: Implications for the Re-Os cosmochronology

Journal Article · Mon Aug 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.025808· OSTI ID:20698940

Shizuma, T ^[1]; Utsunomiya, H; Goko, S; Makinaga, A; Akimune, H; Yamagata, T; Ohta, M ^[2]; Mohr, P ^[3]; Hayakawa, T ^[1]; Ohgaki, H ^[4]; Lui, Y -W ^[5]; Toyokawa, H ^[6]; Uritani, A ^[7]; Goriely, S ^[8]

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1. Advanced Photon Research Center, Japan Atomic Energy Research Institute, 8-1 Umemidai, Kizu, Kyoto 619-0215 (Japan)
2. Department of Physics, Konan University (Japan)
3. Strahlentherapie, Diakoniekrankenhaus Schwaebisch Hall (Germany)
4. Institute of Advanced Energy, Kyoto University (Japan)
5. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
6. Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (Japan)
7. National Metrology Institute, National Institute of Advanced Industrial Science and Technology (Japan)
8. Institute d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles (Belgium)

Cross sections of the {sup 186}W, {sup 187}Re, {sup 188}Os({gamma},n) reactions were measured using quasimonochromatic photon beams from laser Compton scattering with average energies from 7.3 to 10.9 MeV. The results are compared with the predictions of Hauser-Feshbach statistical calculations using four different sets of input parameters. In addition, the inverse neutron capture cross sections were evaluated by constraining the model parameters, especially the E1 strength function, on the basis of the experimental data. The present experiment helps to further constrain the correction factor F{sub {sigma}} for the neutron capture on the 9.75 keV state in {sup 187}Os. Implications of F{sub {sigma}} for the Re-Os cosmochronology are discussed with a focus on the uncertainty in the estimate of the age of the galaxy.

• OSTI ID: 20698940
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
COMPTON EFFECT
CORRECTIONS
CROSS SECTIONS
E1-TRANSITIONS
GALAXIES
HAUSER-FESHBACH THEORY
KEV RANGE
MEV RANGE
NEUTRONS
OSMIUM 188 TARGET
PHOTON BEAMS
PHOTONUCLEAR REACTIONS
RHENIUM 187 TARGET
STRENGTH FUNCTIONS
TUNGSTEN 186 TARGET